Wearable electronic device including lens assembly

Abstract

A display apparatus of the present invention includes a display configured to output light and a lens assembly configured to guide the light output from the display, toward a user' eye, wherein the lens assembly includes: at least three lenses sequentially arranged from the user's eye toward the display along the optical axis; and a polarization assembly, and the polarization assembly includes a first polarization portion, a beam splitter, and a second polarization portion, which are sequentially arranged from the user's eye toward the display, at least one of the at least three lenses may have an Abbe number of 40 or less and negative refractive power, and the beam splitter of the polarization assembly may include a reflective surface formed as an aspherical surface without an inflection point.

Description

Wearable electronic device comprising a lens assembly

[0001] Embodiments of the present disclosure relate to electronic devices, for example, wearable electronic devices including a lens assembly.

[0002] Portable electronic devices, such as electronic notebooks, portable multimedia players, mobile communication terminals, and tablet PCs, typically feature display elements (e.g., display modules) and batteries, and have typically had bar-shaped, folder-shaped, or sliding-type appearances due to the shape of the display elements or batteries. Recently, as the performance of display elements and batteries has improved, they have become smaller, leading to the emergence of electronic devices that can be worn on parts of the body, such as the wrist or head, or in the form of clothing (hereinafter referred to as "wearable electronic devices").

[0003] Examples of wearable electronic devices include head-mounted devices (HMDs), smart glasses, smart watches (or bands), contact lens-type devices, ring-type devices, and clothing / shoe / glove-type devices. These body-worn electronic devices are easy to carry and can improve user accessibility.

[0004] For example, a head-mounted wearable device is a device worn on the user's head or face that projects an image onto the user's retina, allowing the user to view virtual images in three-dimensional space. For example, head-mounted wearable devices can be categorized into see-through types that provide augmented reality (AR) and see-closed types that provide virtual reality (VR). A see-through type head-mounted wearable device can be implemented in the form of glasses, for example, and can provide the user with information such as buildings and objects in the space within the user's field of vision in the form of images or text. A see-closed type head-mounted wearable device can output independent images to both eyes of the user, and can provide the user, or one person, with an excellent sense of immersion by outputting content (games, movies, streaming, broadcasts, etc.) provided by a mobile communication terminal or an external input in the form of images or audio. Additionally, head-mounted wearable devices may be used to provide mixed reality (MR) or extended reality (XR), which are a combination of augmented reality (AR) and virtual reality (VR).

[0005] Recently, product development for head-mounted wearable devices has been actively underway, and they are being used for a variety of purposes, including military, gaming, industrial, and medical applications. Consequently, there is a growing demand for smaller, lighter devices while also providing superior image quality.

[0006] The above information may be provided as background art to aid in understanding the present disclosure. No claim or determination is made as to whether any of the above is applicable as prior art in connection with the present disclosure.

[0007] According to one embodiment of the present disclosure, a display device may be provided. The display device may include a display configured to output light and a lens assembly configured to guide light output from the display toward a user's eye. The lens assembly may include at least three lenses sequentially arranged from a side of the user's eye toward the display along a light axis, and a polarization assembly. The polarization assembly may include a first polarization portion, a beam splitter, and a second polarization portion sequentially arranged from a side of the user's eye toward the display. The at least three lenses of the lens assembly may include a synthetic resin. At least one lens of the at least three lenses may have an Abbe number of 40 or less and have negative refractive power. The beam splitter of the polarization assembly may include a reflective surface formed as an aspherical surface without an inflection point. The display device may satisfy the following [Equation 1].

[0008] [Formula 1]

[0009] 1 <DL / EFL< 3

[0010] (Here, DL is the effective pixel area length of the display, and EFL is the synthetic focal length of the entire optical system (or display device))

[0011] According to one embodiment of the present disclosure, a wearable electronic device may be provided. The wearable electronic device may include a display configured to output light, at least three lenses sequentially arranged from a user's eye side toward the display side along a light axis, and a polarizing assembly configured to reflect light output from the display at least twice between a first lens farthest from the display among the at least three lenses and a lens closest to the display among the at least three lenses. The polarizing assembly may include a first polarization portion, a beam splitter, and a second polarizing portion sequentially arranged from a user's eye side toward the display side. The at least three lenses of the lens assembly may include a synthetic resin. At least one lens of the at least three lenses may have an Abbe number of 40 or less and have negative refractive power. The beam splitter of the polarizing assembly may include a reflective surface formed as an aspheric surface without an inflection point. The above wearable electronic device can satisfy the following [Formula 1].

[0012] [Formula 1]

[0013] 1 <DL / EFL< 3

[0014] (Here, DL is the effective pixel area length of the display, and EFL is the synthetic focal length of the entire optical system)

[0015] The above-described aspects or other aspects, configurations and / or advantages of one embodiment of the present disclosure may be further clarified by the following detailed description taken in conjunction with the accompanying drawings.

[0016] FIG. 1 is a block diagram illustrating an electronic device within a network environment according to one embodiment of the present disclosure.

[0017] FIG. 2 is a diagram illustrating a wearable electronic device according to one embodiment of the present disclosure.

[0018] FIGS. 3 and 4 are drawings showing the front and back of a wearable electronic device according to one embodiment of the present disclosure.

[0019] FIG. 5 illustrates a path along which light output by a display is focused or guided to a user's eye in a wearable electronic device according to one embodiment of the present disclosure.

[0020] FIG. 6A is a diagram illustrating a wearable electronic device according to one embodiment of the present disclosure.

[0021] FIG. 6b is an enlarged view of part A of FIG. 6a according to one embodiment of the present disclosure.

[0022] FIG. 7A is a diagram illustrating a wearable electronic device according to one embodiment of the present disclosure.

[0023] FIG. 7b is an enlarged view of part B of FIG. 7a according to one embodiment of the present disclosure.

[0024] FIG. 8 illustrates a path along which light output by a display is focused or guided to a user's eye in a wearable electronic device according to one embodiment of the present disclosure.

[0025] FIG. 9A is a diagram illustrating a wearable electronic device according to one embodiment of the present disclosure.

[0026] FIG. 9b is an enlarged view of part C of FIG. 9a according to one embodiment of the present disclosure.

[0027] FIG. 10A is a diagram illustrating a wearable electronic device according to one embodiment of the present disclosure.

[0028] FIG. 10b is an enlarged view of part G of FIG. 10a according to one embodiment of the present disclosure.

[0029] Throughout the attached drawings, similar reference numbers may be assigned to similar parts, components and / or structures.

[0030] Wearable electronic devices that implement augmented reality, virtual reality, mixed reality, and / or extended reality can generally be used while worn on the user's head or face. For example, a display that outputs visual information may be positioned at a relatively close distance from the user's eyes. When the display and the user's eyes are positioned at a relatively close distance, it may be difficult to configure an optical system that guides or focuses the visual information to the user's eyes. For example, the size or number of lenses may be limited to reduce the size or weight of the wearable electronic device, and it may be difficult to implement an optical system that can provide good image quality with a limited number of lenses. In one embodiment, in a usage environment where the display and the user's eyes are positioned at a relatively close distance, an optical system with a pancake lens structure may be useful for providing good image quality while using a limited number of lenses. The optical system with a pancake lens structure can implement an optical path that is sufficiently long compared to the mechanical length (e.g., the total length of the lens) by reflecting the visual information output by the display at least twice on the path to the user's eyes. Pancake lens structures can provide excellent image quality while miniaturizing. However, the repeated reflection structure can increase light refraction and scattering. For example, increased refraction and scattering can lead to image quality degradation due to interference between refracted and scattered light.

[0031] One embodiment of the present disclosure is intended to at least resolve the above-described problems and / or disadvantages and at least provide the advantages described below, thereby providing a wearable electronic device including a lens assembly that is easy to control aberrations and thus realizes good image quality.

[0032] One embodiment of the present disclosure can provide a wearable electronic device including a miniaturized and / or lightweight lens assembly while providing good image quality.

[0033] One embodiment of the present disclosure can provide a wearable electronic device that can reduce user fatigue when worn by being miniaturized and / or lightweight.

[0034] The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

[0035] The following description of the accompanying drawings may provide an understanding of various exemplary implementations of the present disclosure, including the claims and their equivalents. While the exemplary embodiments disclosed in the following description include numerous specific details to aid understanding, they are to be considered as one example of various exemplary embodiments. Accordingly, those skilled in the art will appreciate that various modifications and variations of the various implementations described herein may be made without departing from the scope and spirit of the disclosure. Furthermore, descriptions of well-known functions and configurations may be omitted for clarity and conciseness.

[0036] The terms and words used in the following description and claims are not limited to their reference meanings and can be used to clearly and consistently describe one embodiment of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various implementations of the disclosure is provided for illustrative purposes, not for the purpose of limiting the scope of the disclosure and its equivalents.

[0037] Unless the context clearly dictates otherwise, the singular forms of "a," "an," and "the" should be understood to include plural meanings. Thus, for example, "a component surface" could be understood to include one or more of the surfaces of the component.

[0038] FIG. 1 is a block diagram of an electronic device (101) within a network environment (100) according to one embodiment of the present disclosure. Referring to FIG. 1 , in the network environment (100), the electronic device (101) may communicate with the electronic device (102) via a first network (198) (e.g., a short-range wireless communication network), or may communicate with at least one of the electronic device (104) or the server (108) via a second network (199) (e.g., a long-range wireless communication network). In one embodiment, the electronic device (101) may communicate with the electronic device (104) via the server (108). According to one embodiment, the electronic device (101) may include a processor (120), a memory (130), an input module (150), an audio output module (155), a display module (160), an audio module (170), a sensor module (176), an interface (177), a connection terminal (178), a haptic module (179), a camera module (180), a power management module (188), a battery (189), a communication module (190), a subscriber identification module (196), or an antenna module (197). In one embodiment, the electronic device (101) may have at least one of these components (e.g., the connection terminal (178)) omitted, or one or more other components added. In one embodiment, some of these components (e.g., the sensor module (176), the camera module (180), or the antenna module (197)) may be integrated into one component (e.g., the display module (160)).

[0039] The processor (120) may, for example, execute software (e.g., a program (140)) to control at least one other component (e.g., a hardware or software component) of the electronic device (101) connected to the processor (120) and perform various data processing or operations. According to one embodiment, as at least a part of the data processing or operations, the processor (120) may store commands or data received from other components (e.g., a sensor module (176) or a communication module (190)) in a volatile memory (132), process the commands or data stored in the volatile memory (132), and store result data in a non-volatile memory (134). According to one embodiment, the processor (120) may include a main processor (121) (e.g., a central processing unit or an application processor), or an auxiliary processor (123) (e.g., a graphics processing unit, a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor) that can operate independently or together with the main processor (121). For example, when the electronic device (101) includes the main processor (121) and the auxiliary processor (123), the auxiliary processor (123) may be configured to use less power than the main processor (121) or to be specialized for a given function. The auxiliary processor (123) may be implemented separately from the main processor (121) or as a part thereof.

[0040] The auxiliary processor (123) may control at least a portion of functions or states associated with at least one component (e.g., a display module (160), a sensor module (176), or a communication module (190)) of the electronic device (101), for example, on behalf of the main processor (121) while the main processor (121) is in an inactive (e.g., sleep) state, or together with the main processor (121) while the main processor (121) is in an active (e.g., application execution) state. In one embodiment, the auxiliary processor (123) (e.g., an image signal processor or a communication processor) may be implemented as a part of another functionally related component (e.g., a camera module (180) or a communication module (190)). In one embodiment, the auxiliary processor (123) (e.g., a neural network processing unit) may include a hardware structure specialized for processing artificial intelligence models. The artificial intelligence models may be generated through machine learning. This learning can be performed, for example, on the electronic device (101) itself where the artificial intelligence model is executed, or can be performed through a separate server (e.g., server (108)). The learning algorithm can include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but is not limited to the examples described above. The artificial intelligence model can include multiple artificial neural network layers.The artificial neural network may be one of a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), a deep Q-network, or a combination of two or more of the above, but is not limited to the examples described above. In addition to, or alternatively to, a hardware structure, an artificial intelligence model may include a software structure.

[0041] The memory (130) can store various data used by at least one component (e.g., processor (120) or sensor module (176)) of the electronic device (101). The data can include, for example, software (e.g., program (140)) and input data or output data for commands related thereto. The memory (130) can include volatile memory (132) or non-volatile memory (134).

[0042] The program (140) may be stored as software in the memory (130) and may include, for example, an operating system (142), middleware (144), or an application (146).

[0043] The input module (150) can receive commands or data to be used in a component of the electronic device (101) (e.g., a processor (120)) from an external source (e.g., a user) of the electronic device (101). The input module (150) can include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0044] The audio output module (155) can output audio signals to the outside of the electronic device (101). The audio output module (155) can include, for example, a speaker or a receiver. The speaker can be used for general purposes, such as multimedia playback or recording playback. The receiver can be used to receive incoming calls. In one embodiment, the receiver can be implemented separately from the speaker or as part of the speaker.

[0045] The display module (160) can visually provide information to an external party (e.g., a user) of the electronic device (101). The display module (160) may include, for example, a display, a holographic device, or a projector and a control circuit for controlling the device. According to one embodiment, the display module (160) may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of a force generated by the touch.

[0046] The audio module (170) can convert sound into an electrical signal, or vice versa, convert an electrical signal into sound. According to one embodiment, the audio module (170) can acquire sound through the input module (150), output sound through the sound output module (155), or an external electronic device (e.g., electronic device (102)) (e.g., speaker or headphone) directly or wirelessly connected to the electronic device (101).

[0047] The sensor module (176) can detect the operating status (e.g., power or temperature) of the electronic device (101) or the external environmental status (e.g., user status) and generate an electrical signal or data value corresponding to the detected status. According to one embodiment, the sensor module (176) can include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0048] The interface (177) may support one or more designated protocols that may be used to directly or wirelessly connect the electronic device (101) to an external electronic device (e.g., the electronic device (102)). In one embodiment, the interface (177) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

[0049] The connection terminal (178) may include a connector through which the electronic device (101) may be physically connected to an external electronic device (e.g., electronic device (102)). According to one embodiment, the connection terminal (178) may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0050] The haptic module (179) can convert electrical signals into mechanical stimuli (e.g., vibration or movement) or electrical stimuli that a user can perceive through tactile or kinesthetic sensations. According to one embodiment, the haptic module (179) can include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

[0051] The camera module (180) can capture still images and videos. According to one embodiment, the camera module (180) may include one or more lenses, image sensors, image signal processors, or flashes.

[0052] The power management module (188) can manage power supplied to the electronic device (101). According to one embodiment, the power management module (188) can be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

[0053] A battery (189) may power at least one component of the electronic device (101). In one embodiment, the battery (189) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0054] The communication module (190) may support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device (101) and an external electronic device (e.g., electronic device (102), electronic device (104), or server (108)), and the performance of communication through the established communication channel. The communication module (190) may operate independently from the processor (120) (e.g., application processor) and may include one or more communication processors that support direct (e.g., wired) communication or wireless communication. According to one embodiment, the communication module (190) may include a wireless communication module (192) (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (194) (e.g., a local area network (LAN) communication module, or a power line communication module). Among these communication modules, the corresponding communication module can communicate with an external electronic device via a first network (198) (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (199) (e.g., a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules can be integrated into a single component (e.g., a single chip) or implemented as multiple separate components (e.g., multiple chips). The wireless communication module (192) can verify or authenticate the electronic device (101) within a communication network such as the first network (198) or the second network (199) by using subscriber information (e.g., an international mobile subscriber identity (IMSI)) stored in the subscriber identification module (196).

[0055] The wireless communication module (192) can support 5G networks and next-generation communication technologies following the 4G network, such as NR access technology (new radio access technology). The NR access technology can support high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and connection of multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low-latency communications)). The wireless communication module (192) can support, for example, a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate. The wireless communication module (192) can support various technologies for securing performance in a high-frequency band, such as beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module (192) can support various requirements specified in the electronic device (101), an external electronic device (e.g., the electronic device (104)), or a network system (e.g., the second network (199)). According to one embodiment, the wireless communication module (192) can support a peak data rate (e.g., 20 Gbps or more) for eMBB realization, a loss coverage (e.g., 164 dB or less) for mMTC realization, or a U-plane latency (e.g., 0.5 ms or less for downlink (DL) and uplink (UL), or 1 ms or less for round trip) for URLLC realization.

[0056] The antenna module (197) can transmit or receive signals or power to or from an external device (e.g., an external electronic device). In one embodiment, the antenna module may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). In one embodiment, the antenna module (197) may include a plurality of antennas (e.g., an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network, such as the first network (198) or the second network (199), may be selected from the plurality of antennas, for example, by the communication module (190). A signal or power may be transmitted or received between the communication module (190) and an external electronic device via the at least one selected antenna. In one embodiment, in addition to the radiator, another component (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as a part of the antenna module (197).

[0057] In one embodiment, the antenna module (197) may form a mmWave antenna module. In one embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent a first side (e.g., a bottom side) of the printed circuit board and capable of supporting a designated high-frequency band (e.g., a mmWave band), and a plurality of antennas (e.g., an array antenna) disposed on or adjacent a second side (e.g., a top side or a side) of the printed circuit board and capable of transmitting or receiving signals in the designated high-frequency band.

[0058] At least some of the above components can be interconnected and exchange signals (e.g., commands or data) with each other via a communication method between peripheral devices (e.g., a bus, GPIO (general purpose input and output), SPI (serial peripheral interface), or MIPI (mobile industry processor interface)).

[0059] According to one embodiment, commands or data may be transmitted or received between the electronic device (101) and an external electronic device (104) via a server (108) connected to a second network (199). Each of the external electronic devices (102 or 104) may be the same or a different type of device as the electronic device (101). According to one embodiment, all or part of the operations executed in the electronic device (101) may be executed in one or more of the external electronic devices (102, 104, or 108). For example, when the electronic device (101) is to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device (101) may, instead of or in addition to executing the function or service itself, request one or more external electronic devices to perform the function or at least a part of the service. One or more external electronic devices that receive the request may execute at least a portion of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device (101). The electronic device (101) may process the result as is or additionally and provide it as at least a portion of a response to the request. For this purpose, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device (101) may provide an ultra-low latency service by using distributed computing or mobile edge computing, for example. In one embodiment, the external electronic device (104) may include an Internet of Things (IoT) device. The server (108) may be an intelligent server utilizing machine learning and / or a neural network. According to one embodiment, the external electronic device (104) or the server (108) may be included in the second network (199).The electronic device (101) can be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology and IoT-related technology.

[0060] Electronic devices according to embodiments of the present disclosure may take various forms. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. Electronic devices according to embodiments of the present disclosure are not limited to the aforementioned devices.

[0061] The embodiments of the present disclosure and the terminology used therein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to encompass various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the context clearly dictates otherwise. In this document, phrases such as "A or B," "at least one of A and B," "at least one of A or B," "A, B, or C," "at least one of A, B, and C," and "at least one of A, B, or C" each include any one of the items listed together in the corresponding phrase, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used merely to distinguish the corresponding component from other corresponding components, and do not limit the corresponding components in any other respect (e.g., importance or order). When a component (e.g., a first component) is referred to as being "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it is understood that the component can be connected to the other component directly (e.g., wired), wirelessly, or via a third component.

[0062] The term "module" used in the embodiments of the present disclosure may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integral component, or a minimum unit or part of such a component that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0063] Embodiments of the present disclosure may be implemented as software (e.g., a program) including one or more instructions stored in a storage medium (e.g., built-in memory or external memory) readable by a machine (e.g., an electronic device). For example, a processor (e.g., a processor) of the machine (e.g., an electronic device) may call at least one instruction among the one or more instructions stored from the storage medium and execute it. This enables the machine to operate to perform at least one function according to the at least one instruction called. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, "non-transitory" only means that the storage medium is a tangible device and does not contain a signal (e.g., electromagnetic waves), and this term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily in the storage medium.

[0064] According to one embodiment, a method according to an embodiment(s) of the present disclosure may be provided as a computer program product. The computer program product may be traded as a commodity between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) via an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0065] According to one embodiment, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to one embodiment, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to one embodiment, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

[0066] FIG. 2 is a drawing showing a wearable electronic device (200) according to one embodiment of the present disclosure.

[0067] In describing one embodiment of the present disclosure, some numerical values ​​and the like may be presented, but it should be noted that such numerical values ​​do not limit one embodiment of the present disclosure unless stated in the claims.

[0068] Referring to FIG. 2, a wearable electronic device (200) (e.g., electronic device (101) of FIG. 1) is an electronic device that can be worn on a user's head or face, and the user can visually recognize surrounding objects or environments even while wearing the wearable electronic device (200). The wearable electronic device (200) can acquire and / or recognize visual images of objects or environments viewed by the user or in the direction in which the wearable electronic device (200) is directed using a camera module, and can receive information about the objects or environments from an external electronic device via a network. The wearable electronic device (200) can provide the user with information about the objects or environments received in an acoustic or visual form. For example, the wearable electronic device (200) can provide the user with information about the objects or environments received in a visual form using a display member such as a display module (e.g., display module (160) of FIG. 1). The wearable electronic device (200) can implement augmented reality (AR), virtual reality (VR), mixed reality (MR), and / or extended reality (XR) by visualizing information about objects or the environment and combining it with actual images (or videos) of the user's surroundings. The display member can provide the user with information about objects or the environment around him / her by outputting a screen in which an augmented reality object is added to an actual image (or video) of the user's surroundings.

[0069] According to one embodiment, all or part of the operations executed by the electronic device (101) or the wearable electronic device (200) may be executed by one or more of the external electronic devices (102, 104, or 108). For example, when the electronic device (101) or the wearable electronic device (200) is to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device (101) or the wearable electronic device (200) may, instead of executing the function or service by itself or in addition, request one or more of the external electronic devices (102, 104, or 108) to execute the function or at least a part of the service. The one or more external electronic devices that receive the request may execute at least a part of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device (101) or the wearable electronic device (200). The electronic device (101) or the wearable electronic device (200) may provide the result as is or additionally processed as at least a part of the response to the request. For example, the external electronic device (102) may render content data executed in an application and transmit it to the electronic device (101) or the wearable electronic device (200), and the electronic device (101) or the wearable electronic device (200) that receives the data may output the content data to a display module. When the electronic device (101) or the wearable electronic device (200) detects user movement through a sensor(s) such as an inertial measurement unit sensor, the processor (e.g., the processor (120) of FIG. 1) of the electronic device (101) or the wearable electronic device (200) may correct the rendering data received from the external electronic device (102) based on the movement information and output the corrected data to the display module.Or, when a user movement is detected through a sensor(s), a processor (e.g., processor (120) of FIG. 1) of the electronic device (101) or wearable electronic device (200) may transmit the movement information to an external electronic device (102) and request rendering so that screen data is updated accordingly. According to various embodiments, the external electronic device (102) may be a device of various forms, such as a case device capable of storing and charging the electronic device (101).

[0070] It should be noted that the detailed description below may refer to various things such as “a state or position in which an electronic device or a designated component of an electronic device faces the user’s face,” and this is based on the assumption that the user is wearing the wearable electronic device (200).

[0071] According to one embodiment, a wearable electronic device (200) may include at least one display member and a wearing member. Depending on the structure of the display member, the wearable electronic device (200) may further include a structure (e.g., a lens frame) for mounting or supporting the display member. The display members may be provided as a pair including a first display member and a second display member, and may be arranged to correspond to the right and left eyes of the user, respectively, when the wearable electronic device (200) is worn on the user's body. In one embodiment, the wearable electronic device (200) may also include a housing form (e.g., a goggle form) including one display member corresponding to the right eye and the left eye.

[0072] According to one embodiment, the display member is a component provided to provide visual information to a user, and may include, for example, a display (D), a plurality of lenses (L1, L2, L3, L4) (e.g., a lens assembly) and / or at least one sensor. Although a total of four lenses are illustrated in FIG. 2, according to one embodiment, the display member may include three lenses (L1, L2, L3) in which at least one lens (e.g., a fourth lens (L4)) is omitted. Here, the lens assembly and the display (D) may each be formed transparently or translucently. However, the display member is not limited thereto. In one embodiment, the display member may include a window member, and the window member may be a member of a translucent glass material or a member whose light transmittance can be adjusted by adjusting the tinting concentration. In one embodiment, the display member may include a lens including a waveguide, or a reflective lens, and each lens may focus an image output from an optical output device (e.g., a projector or a display (D)) to provide visual information to a user. For example, the display member may include a waveguide (e.g., a light waveguide) in at least a portion of each lens, and may mean a display that transmits an image (or light) output from an optical output device such as a display (D) to a user's eyes through the waveguide included in the display member, and at the same time transmits the real world to the user's eyes through that area in a see-through manner. In one embodiment, the waveguide may be understood as a part of a lens assembly. A lens assembly (e.g., a lens assembly (LA) of FIGS. 5 to 10b) is a configuration including a plurality of lenses (e.g., L1, L2, L3), which can be arranged in a state aligned with an optical axis (e.g., an optical axis (O) of FIGS. 5 to 10b) in a space within a wearable electronic device (200).The configuration in which visual information output from the display (D) is provided to the user's eyes through the lens assembly will be reviewed again below with reference to Fig. 5.

[0073] FIGS. 3 and 4 are drawings showing the front and back of a wearable electronic device (300) according to one embodiment.

[0074] Referring to FIGS. 3 and 4, in one embodiment, camera modules (311, 312, 313, 314, 315, 316) and / or depth sensors (317) for obtaining information related to the surrounding environment of the wearable electronic device (300) may be arranged on a first surface (310) of the electronic device (300) (e.g., housing).

[0075] In one embodiment, the camera modules (311, 312) can acquire images related to the environment surrounding the wearable electronic device.

[0076] In one embodiment, the camera modules (313, 314, 315, 316) can acquire images while the wearable electronic device is worn by a user. The camera modules (313, 314, 315, 316) can be used for hand detection, tracking, and recognition of user gestures (e.g., hand movements). The camera modules (313, 314, 315, 316) can be used for 3DoF (degrees of freedom), 6DoF head tracking, position (spatial, environmental) recognition, and / or movement recognition. In one embodiment, the camera modules (311, 312) can also be used for hand detection and tracking or recognition or detection of user gestures.

[0077] In one embodiment, the depth sensor (317) may be configured to transmit a signal and receive a signal reflected from a subject, and may be used for purposes such as time of flight (TOF) to determine the distance to an object. Instead of or in addition to the depth sensor (317), camera modules (313, 314, 315, 316) may determine the distance to an object.

[0078] According to one embodiment, a camera module (325, 326) for facial recognition and / or a display (331) (and / or a lens) may be disposed on the second side (320) of the housing.

[0079] In one embodiment, a face recognition camera module (325, 326) adjacent to the display may be used to recognize a user's face, or may recognize and / or track both eyes of the user.

[0080] In one embodiment, the display (331) (and / or lens) may be disposed on the second side (320) of the wearable electronic device (300). In one embodiment, the display (331) (and / or lens) may be at least partially similar to, or substantially identical to, the display (D) (and / or lenses L1, L2, L3, L4) of FIG. 2. In one embodiment, the wearable electronic device (300) may not include the camera modules (315, 316) among the plurality of camera modules (313, 314, 315, 316). Although not illustrated in FIGS. 3 and 4 , the wearable electronic device (300) may further include at least one of the configurations illustrated in FIGS. 1 and / or 2 .

[0081] In one embodiment, the display (331) may be understood to include a display module (e.g., display module (160) of FIG. 1) that outputs a screen, and a lens assembly (e.g., lens assembly (LA) of FIGS. 5 to 10B) that focuses the output screen onto the user's eyes. In FIG. 4, it is noted that reference numerals are assigned to portions visible on the exterior of the wearable electronic device (300), indicating the lens closest to the user's eyes among the display (331) (and / or lenses).

[0082] As described above, according to one embodiment, the wearable electronic device (300) may have a form factor for being worn on a user's head. The wearable electronic device (300) may further include a strap and / or a wearing member for being secured to a body part of the user. The wearable electronic device (300) may provide a user experience based on augmented reality, virtual reality, and / or mixed reality while being worn on the user's head.

[0083] FIG. 5 illustrates a path along which light output by a display (D) is focused or guided to a user's eye (Y) in a wearable electronic device (400) according to one embodiment of the present disclosure.

[0084] Referring further to FIG. 5 together with FIG. 2, a wearable electronic device (400) according to one embodiment of the present disclosure may include a display (D) and a lens assembly (LA) configured to refract, transmit, and / or reflect light output from the display (D) and transmit it to a user's eye (Y). In the present disclosure, the display (D) and the lens assembly (LA) may be collectively referred to as a "display device."

[0085] According to one embodiment, the lens assembly (LA) may include a plurality of lenses (L1, L2, L3) (e.g., at least three) and a polarizing assembly (P) including a first polarizing portion (P1) and a second polarizing portion (P2). According to one embodiment, the lenses (L1, L2, L3), the first polarizing portion (P1) and / or the second polarizing portion (P2) may be aligned along a straight ray axis (indicated by dashed line 0 in FIGS. 5, 6A, 7A, 8, 9A, and 10A) extending between the display (D) and the user's eye (Y). According to one embodiment, the polarizing assembly (P) (e.g., the polarizing unit (P1) and the second polarizing unit (P2)) may include at least one quarter wave plate (QWP) (404, 407), at least one reflective polarizer (RP) (403), at least one polarizer (POL) (402, 408), and / or at least one beam splitter (405). According to one embodiment, the lens assembly (LA) may further include at least one anti-reflection (AR) layer (401, 406). According to one embodiment, at least one of the plurality of lenses (L1, L2, L3) may be movable to adjust a diopter, thereby providing a vision correction function to a user.

[0086] According to one embodiment, the polarizing assembly (P) (e.g., the polarizing portion (P1) and the second polarizing portion (P2)) may be disposed between the first lens (L1) (hereinafter, referred to as the “first lens (L1)”) from the user’s eye (Y) among the lenses (L1, L2, L3) of the lens assembly (LA) and the display (D). For example, according to one embodiment, when the polarizing assembly (P) is disposed further from the user’s eye (Y) than the first lens (L1), damage to the polarizing assembly (P) that occurs during manufacturing or use may be reduced or prevented compared to when at least a portion of the polarizing assembly (P) is disposed closer to the user’s eye (Y) than the first lens (L1).

[0087] According to one embodiment, at least one quarter wave plate (404, 407), at least one reflective polarizer (403), and at least one beam splitter (405) included in the polarizing assembly (P) (e.g., the polarizing unit (P1) and / or the second polarizing unit (P2)) can extend and / or adjust the light propagation path length between the user's eye (Y) and the display (D). For example, by implementing a focal length longer than the mechanical or physical length of the lens assembly (LA), the quality of the image provided to the user can be improved. Since wearable electronic devices (e.g., AR / VR glasses) are limited in size or weight due to the actual use environment (e.g., used in a worn state), the resolution of the output virtual image may be limited, and it may be difficult to provide a good quality image to the user even through the optical system. According to one embodiment, the wearable electronic device (400) may include an optical system (e.g., a lens assembly (LA)) having a pancake lens structure, thereby extending the optical path length of incident light relative to its external size and / or increasing the image resolution provided to the user. For example, the wearable electronic device (400) may be an optical device (e.g., AR / VR glasses) that provides visual information to the user while being worn on the user's head or face by including a display (D) and a lens assembly (LA).

[0088] According to one embodiment, the display (D) may include a screen display area that displays visual information to portions corresponding to the user's eyes when the user wears the wearable electronic device (400). In one embodiment, the wearable electronic device (400) may include a pair of displays (D) corresponding to the user's eyes. The displays (D) may include, for example, a liquid crystal display (LCD), a light emitting diode (LED) display, an organic light emitting diode (OLED) display, a micro electro mechanical system (MEMS) display, or an electronic paper display. The displays (D) may display, for example, various contents (e.g., text, images, videos, icons, symbols, etc.) provided as visual information to the user.

[0089] According to one embodiment, various contents (e.g., text, images, videos, icons, or symbols, etc.) output in the form of light from the display (D) may be provided to the user's eyes by passing through at least one 1 / 4 wave plate (404, 407), at least one reflective polarizer (403), at least one beam splitter (405), and / or a plurality of lenses (L1, L2, L3). The order in which light passes through at least one 1 / 4 wave plate (404, 407), at least one reflective polarizer (403), at least one beam splitter (405), and / or a plurality of lenses (L1, L2, L3) may be set in various ways depending on the embodiment.

[0090] According to one embodiment, the wearable electronic device (400) may further include a cover window (e.g., the cover window (W) of FIGS. 6A, 7A, 9A, and 10A) disposed on the eye side of the display (D) of the user. According to one embodiment, light output from the display (D) may pass through the cover window (e.g., the cover window (W) of FIGS. 6A, 7A, 9A, and 10A) and be transmitted to the lens assembly (LA). In the present disclosure, “disposed on XX” may refer to being disposed adjacent to or in substantial contact with XX.

[0091] In one embodiment, the first polarizing portion (P1) may be configured to selectively transmit, reflect, and / or block light output from the display (D) and transmitted through the remaining lenses (L2, L3) other than the first lens (L1), the beam splitter (405), and the second polarizing portion (P2) and transmit the light to the first lens (L1). In one embodiment, the first polarizing portion (P1) may be disposed between the first lens (L1) furthest from the display (D) and the second lens (L2) furthest from the display (D). In one embodiment (see, for example, FIGS. 6A and 6B), the first polarizing portion (P1) may be disposed on the subject-side surface (E2) of the second lens (L2). In one embodiment (see, for example, FIGS. 7A to 10B), the first polarizing portion (P1) may be disposed on the display-side surface (D1) of the first lens (L1).

[0092] In one embodiment, the first polarizing unit (P1) may include a first anti-reflection layer (401), a first polarizer (402), a reflective polarizer (403), and / or a first 1 / 4 wave plate (404). For example, the first anti-reflection layer (401), the first polarizer (402), the reflective polarizer (403), and / or the first 1 / 4 wave plate (404) may be formed in a film form. In one embodiment, the first anti-reflection layer (401), the first polarizer (402), the reflective polarizer (403), and / or the first 1 / 4 wave plate (404) of the first polarizing unit (P1) may be formed by being bonded to each other or spaced apart from each other with an air layer (or air gap), another polarizing layer, and / or a dummy layer therebetween. Here, the air layer, the adhesive layer, the another polarizing layer, and / or the dummy layer may have substantially no refractive power. Here, for example, the phrase "any two members among the first anti-reflection layer (401), the first polarizer (402), the reflective polarizer (403), and / or the first 1 / 4 wave plate (404) are spaced apart from each other with an adhesive layer, another polarizing layer, or a dummy layer therebetween" may refer to a structure in which any two members are laminated. Here, "lamination" may mean that at least one of the two different members is provided with an adhesive and is bonded to each other. For example, when the first anti-reflection layer (401) and the first polarizer (402) are laminated, the first anti-reflection layer (401) and the first polarizer (402) can be bonded to each other with an adhesive layer disposed therebetween, and in this case, the first anti-reflection layer (401) and the first polarizer (402) can be laminated with another polarizing layer (and / or dummy layer) disposed therebetween, and the first anti-reflection layer (401), the other polarizing layer (and / or dummy layer), and the first polarizer (402) can be laminated with each other and bonded to each other by the adhesive layer.For example, a first polarizing portion (P1) formed by laminating a first anti-reflection layer (401), a first polarizer (402), a reflective polarizer (403), and / or a first 1 / 4 wave plate (404) may be thinner and have superior optical performance than a polarizing member formed in a simple laminated film form. According to one embodiment, some components of the first polarizing portion (P1) (e.g., the first anti-reflection layer (401)) may be omitted.

[0093] In one embodiment, the beam splitter (405) may be configured to transmit a portion of the light incident thereon and reflect another portion of the light incident thereon. For example, the beam splitter (405) may be configured to transmit about 50% of the light and reflect about 50% of the light. In one embodiment, the beam splitter (405) may be configured as a translucent mirror, for example, in the form of a mirror coated on one surface of the second lens (L2) (e.g., the display-side surface (D2) of the second lens (L2) of FIGS. 9A to 10B) or one surface of the third lens (L3) (e.g., the display-side surface (D3) of the third lens (L3) of FIGS. 6A to 7B).

[0094] According to one embodiment (e.g., see FIGS. 5 to 7B), the beam splitter (405) (e.g., the beam splitter (BS) of FIGS. 5 to 7B) may be disposed on one of two surfaces of the third lens (L3) (hereinafter, referred to as the “third lens (L3)”) of the lens assembly (LA) from the user’s eye (Y). In the present disclosure, “disposed on XX” may refer to being disposed adjacent to or substantially in contact with XX. In the present disclosure, “two surfaces” of any lens may refer to the user’s eye (Y)-side surface and the display (D)-side surface of any lens. In one embodiment, the beam splitter (405) may be disposed adjacent to (or substantially in contact with) the display-side surface of the third lens (L3) (or may be disposed on the display-side surface). However, in the present disclosure, the position of the beam splitter (405) may be changed, and according to one embodiment (e.g., see FIGS. 8 to 10b), the beam splitter (405) may be placed on one of the two sides (e.g., the display side) of the second lens (L2) (hereinafter, referred to as “second lens (L2)”) from the user’s eye (Y) of the lens assembly (LA).

[0095] According to one embodiment, the second polarizing portion (P2) may be arranged closer to the display (D) than the first polarizing portion (P1) to selectively transmit and / or block light output from the display (D) and transmit it to the lenses (L1, L2 and / or L3), the beam splitter (405) and the first polarizing portion (P1).

[0096] In one embodiment (e.g., see FIGS. 5 to 7B), the second polarizing portion (P2) can be disposed between the lens assembly (LA) (e.g., the third lens (L3)) and the display (D). According to one embodiment (e.g., see FIGS. 5 to 7B), the second polarizing portion (P2) can be disposed on a cover window (W) disposed on a user's eye-side surface of the display (D). According to one embodiment (e.g., see FIGS. 8, 9A and 9B), the second polarizing portion (P2) can be disposed between the third lens (L3) closest to the display (D) and the second lens (L2) second closest to the display (D). According to one embodiment (e.g., see FIGS. 9A and 10A), the third lens (L3) closest to the display (D) can be disposed on the display-side surface (e.g., see FIG. 10A) or the user's eye-side surface (e.g., see FIG. 9A). According to one embodiment, a surface (e.g., a display-side surface or a user's eye-side surface) of a lens (e.g., a third lens (L3)) to which the first polarizing portion (P1) is attached can be implemented as a substantially flat surface.

[0097] In one embodiment, the second polarizing unit (P2) may include a second anti-reflection layer (406), a second polarizer (408), and / or a second 1 / 4 wave plate (407). For example, the second anti-reflection layer (406), the second polarizer (408), and / or the second 1 / 4 wave plate (407) may be formed in a film form. In one embodiment, the second anti-reflection layer (406), the second polarizer (408), and / or the second 1 / 4 wave plate (407) of the second polarizing unit (P2) may be formed by being bonded to each other or by being disposed with an air layer (or air gap), another polarizing layer, and / or a dummy layer therebetween. Here, the air layer, the adhesive layer, the another polarizing layer, and / or the dummy layer may have substantially no refractive power. Here, for example, the phrase "any two members of the second anti-reflection layer (406), the second polarizer (408), and / or the second 1 / 4 wave plate (407) are spaced apart from each other with an adhesive layer, another polarizing layer, or a dummy layer therebetween" may refer to a structure in which the two members are laminated. In one embodiment, the term "lamination" here may mean that at least one of the two different members is provided with an adhesive and is bonded to each other. For example, when the second anti-reflection layer (406) and the second polarizer (408) are laminated, the second anti-reflection layer (406) and the second polarizer (408) can be bonded to each other with an adhesive layer disposed therebetween, and in this case, the second anti-reflection layer (406) and the second polarizer (408) can have another polarizing layer (and / or a dummy layer) interposed therebetween, and the second anti-reflection layer (406), the other polarizing layer (and / or the dummy layer), and the second polarizer (408) can be laminated to each other and bonded to each other by the adhesive layer. For example, the second polarizing member (P2) in the form of a laminated second anti-reflection layer (406), the second polarizer (408), and / or the second 1 / 4 wavelength plate (407) can be thinner and have superior optical performance than a polarizing member in the form of a simply laminated film.In one embodiment, some components of the second polarizing portion (P2) (e.g., the second anti-reflection layer (406)) may be omitted.

[0098] In the illustrated embodiment, the first lens (L1) of the wearable electronic device (400) or the lens assembly (LA) may be understood as the lens positioned furthest from the display (D) among a plurality of lenses (e.g., at least three lenses), or the lens positioned closest to the user's eye (Y). However, it should be noted that the embodiments of the present disclosure are not limited thereto. For example, although not illustrated, the wearable electronic device (400) or the lens assembly (LA) may further include a transmissive optical member positioned farther from the display (D) than the first lens (L1). In one embodiment, the transmissive optical member can have a refractive power that does not affect the optical performance of the wearable electronic device (400, 500, 600, 700) of FIGS. 5, 6A, 7A, 8, 9A, and 10A and / or the lens assembly (LA) of FIGS. 5, 6A, 7A, 8, 9A, and 10A. In one embodiment, the transmissive optical member positioned further from the display (D) than the first lens (L1) can have a transmittance of about 90% or greater for visible light. In one embodiment, the transmissive optical member can have a transmittance close to 100% for visible light.

[0099] According to one embodiment, a liquid crystal display, an organic light emitting diode display, and / or a micro LED can provide a good quality image by including a polarizing plate. In one embodiment, when a lens assembly (LA) further includes a first polarizing portion (P1), the image quality perceived by a user can be improved even if the display (D) outputs an image of the same quality. In one embodiment, when combined with a lens assembly (LA) including a first polarizing portion (P1) and a second polarizing portion (P2), some polarizing plates can be omitted from a display (D) implemented as an organic light emitting diode display or a micro LED.

[0100] In the following description, the direction from the user's eye (Y) toward the display (D) may be referred to as a first direction, and the direction from the display (D) toward the user's eye (Y) opposite to the first direction may be referred to as a second direction. The first direction and the second direction may be substantially parallel to the light axis (O). The lens assembly (LA) may include a plurality of lenses (e.g., a first lens (L1), a second lens (L2), and a third lens (L3)) sequentially arranged along the first direction.

[0101] According to one embodiment, the arrangement of the polarizers (P1, P2) and / or the beam splitter (405) of the polarizing assembly (P) described above can provide a good quality image while miniaturizing the optical system implemented with a limited number (e.g., at least 3) of lenses (L1, L2, L3). According to one embodiment, the polarization axis of the first polarizer (402) of the first polarizer (P1) and the polarization axis of the second polarizer (408) of the second polarizer (P2) can form 90 degrees. The fast axis of the first 1 / 4 wave plate (404) of the first polarizer (P1) and the fast axis of the second 1 / 4 wave plate (407) of the second polarizer (P2) can form 90 degrees. In the following description, reference to the anti-reflection members (401, 406) may be omitted.

[0102] Referring to FIG. 5, according to one embodiment, the wearable electronic device (400) may operate as follows. Light output from the display (D) may reach the user's eye (Y) after passing through at least three lenses (L1, L2, L3) of the lens assembly (LA), the second polarizing unit (P2), the beam splitter (BS), and the first polarizing unit (P1). At this time, the second polarizer (408) of the second polarizing unit (P2) may transmit the first linear polarization, for example, vertical polarization (or p polarization), and may not transmit the second linear polarization, for example, horizontal polarization (or s polarization). For example, among the light reaching the second polarizer (408), only vertical polarization (or p polarization) may be transmitted. Light passing through the second polarizer (408) is converted into circular polarization (right-hand circular polarization or left-hand circular polarization) by the second 1 / 4 wave plate (407), and this circular polarization can pass through the beam splitter (405), the third lens (L3), and the second lens (L2) in sequence before reaching the first 1 / 4 wave plate (404). The circular polarization reaching the first 1 / 4 wave plate (404) is converted back into linear polarization (e.g., vertical polarization (or p-polarization)) while passing through the first 1 / 4 wave plate (404) and can reach the reflective polarizer (403). Until reaching the reflective polarizer (403), the light can move in the second direction (display (D) -> user's eye (Y)). Light reaching the reflective polarizer (403) is reflected by the reflective polarizer (403) and directed in the first direction (user's eye (Y) -> display (D)), and can be converted into circular polarization (right-hand polarization or left-hand circular polarization) while passing through the first 1 / 4 wave plate (404). This circular polarization (right-hand polarization or left-hand circular polarization) is reflected by the beam splitter (405) and directed in the second direction again, and at this time, the phase can be converted (for example, when it is left-hand circular polarization -> right-hand circular polarization, when it is right-hand circular polarization -> left-hand circular polarization).The phase-converted circular polarization can pass through the first 1 / 4 wave plate (404) and the reflective polarizer (403) along the second direction to reach the user's eye (Y). At this time, the light passing through the first 1 / 4 wave plate (404) is converted into horizontal polarization (or s polarization) and can reach the user's eye (Y). However, it should be noted that the embodiment of FIG. 5 exemplarily mentions the state change of light passing through the wearable electronic device (400) according to one embodiment, and the conversion of polarization components by the reflective polarizer (403), the 1 / 4 wave plates (404, 407), the beam splitter (405), and / or the second polarizer (408) may be different from the mentioned embodiment.

[0103] FIG. 6A is a diagram illustrating a wearable electronic device (400) (e.g., the electronic device (101) of FIG. 1 or the wearable electronic devices (200, 300, 400) of FIGS. 2 to 5) according to one embodiment of the present disclosure. FIG. 6B is a diagram illustrating an enlarged portion A of FIG. 6A according to one embodiment of the present disclosure.

[0104] The lens assembly (LA) and display (D) of FIG. 6a may be referred to as the lens assembly (LA) and display (D) of FIG. 5, and any description overlapping with the above description with reference to FIG. 5 may be omitted below.

[0105] Referring to FIGS. 6A and 6B , a wearable electronic device (400) may include a display (D) and a lens assembly (LA), and visual information output from the display (D) may be focused or guided by the lens assembly (LA) and provided to the user's eye (Y). The lens assembly (LA) may include a plurality of, for example, at least three lenses (L1, L2, L3) sequentially arranged along the direction of the light axis (O) (e.g., lenses (L1, L2, L3) of FIG. 5 ). For convenience of explanation, or as described above, the plurality of lenses (L1, L2, L3) may be described separately by being indicated by an ordinal number such as 'first' or 'second' according to the order in which they are arranged in the direction from the user's eye (Y) side toward the display (D). In the reference numbers of the drawings, 'Ln' may indicate the n-th lens, 'En' may indicate the user eye side of the n-th lens, and 'Dn' may indicate the display side of the n-th lens.

[0106] According to one embodiment, the lens assembly (LA) of the wearable electronic device (400) may include a first polarizing portion (P1), a beam splitter (BS), and a second polarizing portion (P2) sequentially arranged from the user's eye (Y) side to the display (D) side. According to one embodiment, the first polarizing portion (P1) of the polarizing assembly (P) (e.g., the first polarizing portion (P1) of FIG. 5 ) may be disposed on, for example, the user's eye-side surface (E2) of the second lens (L2). The second polarizing portion (P2) of the polarizing assembly (P) (e.g., the second polarizing portion (P2) of FIG. 5 ) may be disposed on the cover window (W). Referring to FIG. 6b, a beam splitter (BS) (e.g., beam splitter (405) of FIG. 5) may be disposed between the first polarizing portion (P1) and the second polarizing portion (P2), for example, on the display-side surface (D3) of the third lens (L3). In one embodiment, when the first polarizing portion (P1) is substantially attached to a surface of any one of the lenses (L1, L2, L3), the corresponding lens surface (e.g., the user's eye-side surface (E2) of the second lens (L2)) may be substantially flat.

[0107] As described with reference to FIG. 5, light or visual information output from the display (D) can be sequentially transmitted through the second polarizing portion (P2) and the beam splitter (BS), and then sequentially reflected by the first polarizing portion (P1) and the beam splitter (BS). The light or visual information reflected by the beam splitter (BS) can be transmitted through the first polarizing portion (P1) and provided to the user. For example, at least a portion of the light or visual information output from the display (D) can be transmitted through the second polarizing portion (P2) and the beam splitter (BS) and reach the first polarizing portion (P1). The first polarizing portion (P1) can reflect at least a portion of the incident light (e.g., light transmitted through the second polarizing portion (P2) and the beam splitter (BS)), and the beam splitter (BS) can reflect at least a portion of the light reflected by the first polarizing portion (P1) again to guide the light toward the user's eye (Y). As a result, the visual information output from the display (D) can be reflected at least twice on the way to the user's eye (Y). Although the lenses (L1, L2, L3) are not mentioned when describing the path of light passing through the polarizing portions (P1, P2) and / or the beam splitter (BS), the visual information output from the display (D) can be focused by the lenses (L1, L2, L3) on the way to the user's eye (Y).

[0108] In one embodiment, the 'polarizer' may be referred to as a polarizer, a polarizing member, a polarizing film, a polarizing sheet, a polarizing layer, a modulating member, a modulating film, and / or a modulating sheet. Here, 'modulating' may refer to filtering, reflecting, refracting, phase-modulating, and / or phase-retarding at least a portion of incident light. In one embodiment, the modulation tendency of the polarizer may vary depending on the wavelength of the incident light or the polarization component of the incident light. Such a polarizer may be implemented by a film, a sheet, a coating material, and / or a deposition material.

[0109] In one embodiment, the second polarizing unit (P2) may include a second polarizer (e.g., the second polarizer (408) of FIG. 5) and a second 1 / 4 wave plate (e.g., the second 1 / 4 wave plate (407) of FIG. 5) arranged to face the second polarizer (408). When the second polarizer (408) and the second 1 / 4 wave plate (407) are arranged, the polarization axis linearly polarized by the second polarizer (408) and the fast axis of the second 1 / 4 wave plate (407) may form a 45 degree angle. For example, the second polarizing unit (P2) may be configured to convert linearly polarized light into circularly polarized light. In one embodiment, when the first polarizing unit (P1) includes the first polarizer (402), the polarization axis of the first polarizer (402) and the second The polarization axis of the polarizer (408) may form a 90 degree angle. In one embodiment, the fast axis of the first 1 / 4 wave plate (404) and the fast axis of the second 1 / 4 wave plate (407) may form a 90 degree angle.

[0110] According to one embodiment, the beam splitter (BS) may be provided on one surface of the lens closest to the display (D) (e.g., the display-side surface (D3) of the third lens (L3)). According to one embodiment, the lens surface on which the beam splitter (BS) is arranged (e.g., the display-side surface (D3) of the third lens (L3)) may be formed as an aspherical surface without inflection, thereby securing a wide field of view while preventing degradation of optical performance due to a sudden change in the optical path (e.g., reflection). For example, the beam splitter (BS) may be laminated or formed on the display-side surface (D3) of the third lens (L3) by substantially depositing or coating an optical material.

[0111] In one embodiment, the optical length of the lens assembly (LA) may be greater than the mechanical (or physical) length by including a first polarizing member (P1) and a beam splitter (BS) that function as reflective members, while the number of lenses (or lens surfaces) arranged between the first polarizing member (P1) and the beam splitter (BS) may be minimized. For example, in a miniaturized lens assembly (LA) structure, a sufficient optical length may be secured by the reflective members (e.g., the first polarizing member (P1) and the beam splitter (BS)), and by reducing the number of lenses or lens surfaces arranged between the reflective members (e.g., the first polarizing member (P1) and the beam splitter (BS)), an increase in refraction or scattering may be suppressed, and the lens assembly (LA) may provide an image of improved quality. In one embodiment, the above-described 'refraction or scattering' may refer to birefringence due to manufacturing errors or errors occurring during assembly within an acceptable range. For example, by reducing the number of lenses or lens surfaces arranged between reflective elements (e.g., the first polarizing element (P1) and the beam splitter (BS)), the birefringence of the lens can be suppressed, and the lens assembly (LA) can provide an image of improved quality.

[0112] According to one embodiment, the entire display device including the lens assembly (LA) and the display (D) of the wearable electronic devices (400; 500; 600; 700) of FIGS. 5 to 6B described above and FIGS. 7A to 10D described below can provide good wide-angle or ultra-wide-angle performance by having a field of view (FOV) of about 100 degrees or more, and can have the lens characteristics described below. In one embodiment, the user's eye-side surface (E1) of the first lens (L1) can be formed to be convex toward the user's eye (Y) side, and accordingly, the thickness (e.g., thickness in the direction of the optical axis (O)) of the structure (e.g., lens barrel) that fixes the first lens (L1) can be reduced, thereby contributing to a thickness reduction or thinning of the entire display device including the lens assembly (LA) and the display (D). In one embodiment, in the lenses (L1, L2, L3), the surfaces on which the polarizing parts (P1, P2) are attached may be substantially flat. According to one embodiment, in the structure in which the polarizing parts (P1, P2) and / or the beam splitter (BS) as described above are arranged, at least one lens among the three lenses (L1, L2, L3) may have an Abbe number of about 40 or less. According to one embodiment, at least one lens among the three lenses (L1, L2, L3) may have an Abbe number of about 40 or less and negative refractive power, and the remaining two lenses may have positive refractive power. When at least one lens among the three lenses (L1, L2, L3) is designed to have an Abbe number of about 40 or less and negative refractive power, the chromatic aberration control performance and optical performance of the lens assembly (LA) of the wearable electronic device (400) may be improved.

[0113] According to one embodiment, the entire display device including the lens assembly (LA) and the display (D) of the wearable electronic devices (400; 500; 600; 700) of FIGS. 5 to 6b described above and FIGS. 7a to 10d described below can satisfy the conditions presented through the following [Formula 1].

[0114] [Formula 1]

[0115] 1 <DL / EFL< 3

[0116] Here, DL is the effective pixel area length of the display (D), and EFL may be the synthetic focal length of the entire optical system. In the present disclosure, the 'focal length of the entire optical system' may refer to the synthetic focal length including the display (D) and the lens assembly (LA) (or the synthetic focal length of the entire display device). For example, if the calculated value of [Formula 1] is less than about 1, the display field of view may become small, making it difficult to provide good wide-angle or ultra-wide-angle performance, and the product competitiveness of the wearable electronic device may be weakened. For example, if the calculated value of [Formula 1] is greater than about 3, the field of view may become larger than the designed value, and the optical performance of the display device may deteriorate compared to the designed performance.

[0117] In one embodiment, the display (D) and lens assembly (LA) (or display device) may have an angle of view of about 108.00 degrees, a focal length (EFL) of about 15.12 mm, and an F-number (or Fno) of about 3.82. In one embodiment, the effective pixel area length (DL) of the display (D) may be about 24.72 mm, and the DL / EFL value may be about 1.63, which may satisfy the above-described [Equation 1].

[0118] In one embodiment, a lens assembly (LA) (e.g., electronic device (400)) may be manufactured with the specifications presented in [Table 1] and may have aspheric coefficients of [Table 2] and [Table 3]. The definition of asphericity may be calculated through the following [Equation 2]. In [Table 1], 'REF.' exemplifies reference numbers assigned to lenses (L1, L2, L3) and / or polarizers (P1, P2) of FIGS. 6A and 6B, and 'lens surface' describes an ordinal number assigned to a surface of a lens or polarizer that transmits (or reflects) visual information, and may be sequentially assigned an ordinal number along the reverse direction of the optical path from the display (D) to the user's eye (Y). The 'Display window' (e.g., the cover window (W) of FIG. 6) of [Table 1] may be a substantially transparent plate as a plate for protecting a display.

[0119] The aspheric coefficients of the tables described below, including [Table 2] or [Table 3], can be calculated from [Formula 2] below.

[0120] [Formula 2]

[0121]

[0122] In [Formula 2], "z" is the distance in the direction of the ray axis (O) from the point where the ray axis (O) passes on the lens surface, "y" is the distance from the ray axis (O) in the direction perpendicular to the ray axis (O), 'c'' is the reciprocal of the radius of curvature at the vertex of the lens, 'k' is the Conic constant, and 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', and 'O' may each represent an aspheric coefficient. The 'reciprocal of the radius of curvature' may represent a value (e.g., curvature) indicating the degree of curvature at each point of a curved surface or curve. Among the aspheric coefficient(s) of [Formula 2], the aspheric coefficient whose value is 0 (zero) may be omitted from [Table 2] or [Table 3] described below.

[0123] REF.Lens surface (surface) Radius of curvature (radius) Thickness (Thick) Material Refractive index (nd) Abbe number (vd) Refractive mode User's eye (EYE) Infinity infinity Refractive aperture (STOP) Infinity 10.000 Refractive L1260.5394.042 OPTIMAS75001.49757.39 Refractive 3-1399.7270.123 Refractive P14 Infinity 0.252 FILM 1.49557.47 Refractive L26 Infinity 1.864 SP38101.64923.25 Refractive 7151.9400.130 Refractive L3865.6177.620 OPTIMAS75001.49757.39 Refractive 9-53.853-7.620 OPTIMAS7500-1.49757.39 Reflective L21065.617-0.130 Refractive 11151.940-1.864 SP3810-1.64923.25 Refractive Polarizing Film 12infinity-0.134 FILM-1.49557.47 Refractive Polarizing Film 13infinity0.134 FILM1.49557.47 Reflective L214infinity1.864 SP38101.64923.25 Refractive 15151.9400.130 Refractor L31665.6177.620 OPTIMAS75001.49757.39 Refractor 17-53.8530.587 Refractor P218 infinity 0.242 FILM 1.49557.47 Refractor Display window 19 infinity 0.500 BSC7_HOYA 1.52064.2 Refractor 20 infinity 0.010 Refractor display infinity 0.000

[0124] Surf23789곡률반경(Radius)6.05E+01-1.40E+031.52E+026.56E+01-5.39E+01k(conic)8.50E+00-9.90E+01-8.89E+01-6.35E+00-8.39E+00A(4th) / C4-2.11E-05-1.27E-055.79E-058.65E-05-2.74E-06B(6th) / C54.51E-08-1.74E-07-2.54E-07-6.56E-07-5.81E-09D(10th) / C79.80E-137.23E-122.56E-12-6.34E-12-5.18E-13E(12th) / C8-1.80E-15-5.23E-14-5.31E-159.39E-151.00E-15F(14th) / C90.00E+001.25E-163.46E-18-5.88E-18-6.69E-19G(16th) / C100.00E+00-1.01E-190.00E+000.00E+000.00E+00

[0125] Surf1011151617곡률반경(Radius)6.56E+011.52E+021.52E+026.56E+01-5.39E+01k(conic)-6.35E+00-8.89E+01-8.89E+01-6.35E+00-8.39E+00A(4th) / C48.65E-055.79E-055.79E-058.65E-05-2.74E-06B(6th) / C5-6.56E-07-2.54E-07-2.54E-07-6.56E-07-5.81E-09D(10th) / C7-6.34E-122.56E-122.56E-12-6.34E-12-5.18E-13E(12th) / C89.39E-15-5.31E-15-5.31E-159.39E-151.00E-15F(14th) / C9-5.88E-183.46E-183.46E-18-5.88E-18-6.69E-19G(16th) / C100.00E+000.00E+000.00E+000.00E+000.00E+00

[0126] FIG. 7A is a diagram illustrating a wearable electronic device (500) (e.g., the electronic device (101) of FIG. 1 or the wearable electronic devices (200, 300, 400) of FIGS. 2 to 5) according to one embodiment of the present disclosure. FIG. 7B is a diagram illustrating an enlarged portion B of FIG. 7A according to one embodiment of the present disclosure.

[0127] The lens assembly (LA) and display (D) of FIG. 7a may be referred to as the lens assembly (LA) and display (D) of FIG. 5. In the description of the lens assembly (LA) and display (D) of FIG. 7a, any content that overlaps with the description given above with reference to FIGS. 6a and 6b may be omitted below.

[0128] According to one embodiment, the lens assembly (LA) of the wearable electronic device (500) may include a first polarizing portion (P1), a beam splitter (BS), and a second polarizing portion (P2) sequentially arranged from the user's eye (Y) side to the display (D) side. According to one embodiment, the first polarizing portion (P1) of the polarizing assembly (P) (e.g., the first polarizing portion (P1) of FIG. 5 ) may be disposed on, for example, the display-side surface (D1) of the first lens (L1). The second polarizing portion (P2) of the polarizing assembly (P) (e.g., the second polarizing portion (P2) of FIG. 5 ) may be disposed on the cover window (W). In one embodiment, when the first polarizing element (P1) is substantially attached to a surface of any one of the lenses (L1, L2, L3), the corresponding lens surface (e.g., the display-side surface (D1) of the first lens (L1)) may be substantially planar.

[0129] In one embodiment, a beam splitter (BS) (e.g., beam splitter (405) of FIG. 5) may be disposed between the first polarizing portion (P1) and the second polarizing portion (P2). In one embodiment, referring to FIG. 7B, the beam splitter (BS) may be provided on the display-side surface (D3) of the third lens (L3). For example, the beam splitter (BS) may be laminated or formed on the display-side surface (D3) of the third lens (L3) by substantially depositing or coating an optical material. In one embodiment, the first polarizing portion (P1) and the beam splitter (BS), which function as a reflective member, are disposed such that the optical length of the lens assembly (LA) becomes larger than the mechanical (or physical) length, but the number of lenses (or lens surfaces) disposed between the first polarizing portion (P1) and the beam splitter (BS) may be minimized. For example, in a miniaturized lens assembly (LA) structure, a sufficient optical length can be secured by the reflective members (e.g., the first polarizing unit (P1) and the beam splitter (BS)), and by reducing the number of lenses or lens surfaces arranged between the reflective members (e.g., the first polarizing unit (P1) and the beam splitter (BS)), an increase in refraction or scattering can be suppressed, and the lens assembly (LA) can provide an image of improved quality. In one embodiment, the above-described 'refraction or scattering' may refer to birefringence due to manufacturing errors or errors occurring during the assembly process within an acceptable range. For example, by reducing the number of lenses or lens surfaces arranged between the reflective members (e.g., the first polarizing unit (P1) and the beam splitter (BS)), birefringence of the lens can be suppressed, and the lens assembly (LA) can provide an image of improved quality.

[0130] In one embodiment, the display (D) and lens assembly (LA) (or display device) may have an angle of view of about 100.00 degrees, a focal length (EFL) of about 14.97 mm, and an F-number (or Fno) of about 3.18. In one embodiment, the effective pixel area length (DL) of the display (D) may be about 23.20 mm, and the DL / EFL value may be about 1.55, which may satisfy the above-described [Equation 1].

[0131] In the present disclosure, the 'effective pixel area length (DL)' of the display (D) may refer to the height of the display (D). Here, the 'height of the display (D)' may refer to a straight line length measured based on an axis perpendicular to the light axis (O), which is indicated as 'DL' in FIGS. 6a, 7a, 9a, and 10a.

[0132] In one embodiment, the lens assembly (LA) can be manufactured with the specifications presented in [Table 4] and can have aspheric coefficients of [Table 5] and [Table 6]. In [Table 4], 'REF.' exemplifies reference numbers assigned to lenses (L1, L2, L3) and / or polarizers (P1, P2) of FIGS. 7A and 7B, and 'lens surface' describes an ordinal number assigned to a surface of a lens or polarizer that transmits (or reflects) visual information, and may be sequentially assigned an ordinal number along the reverse direction of the optical path from the display (D) to the user's eye (Y). The 'Display window' of [Table 4] (e.g., the cover window (W) of FIG. 6) may be a substantially transparent plate as a plate for protecting the display.

[0133] REF.Lens surface (surface)Radius of curvature (radius)Thickness (Thick)MaterialRefractive index (nd)Abbe number (vd)Refraction modeEYEinfinityinfinityRefractionSTOPinfinity10.000RefractionL12103.9943.300OPTIMAS75001.49757.38Refraction3infinity0.300FILM1.49557.47RefractionP15infinity0.130RefractionL26834.1281.590SP38101.64423.98Refraction798.5720.140 Refractive L3852.7887.932OPTIMAS75001.49757.38Refractive 9-52.137-7.932OPTIMAS7500-1.49757.38Refractive 1052.788-0.140Refractive L21198.572-1.590SP3810-1.64423.98Refractive 12834.128-0.130Refractive Polarizing Film 13infinity-0.210FILM-1.49557.47Refractive Polarizing Film 14infinity0.210FILM1.49557.47Refractive Polarizing Film 15infinity0.130 Refractor L216834.1281.590SP38101.64423.98Refraction1798.5720.140 Refractor L31852.7887.932OPTIMAS75001.4975.74E+01Refraction19-52.1370.580 Refractor P220infinity0.176FILM1.4955.75E+01RefractionDisplay window21infinity0.500BSC7_HOYA1.5206.42E+01Refraction22infinity0.010 Refractor displayinfinity0.000

[0134] Surf278910 Radius of curvature (Radius)1.0E+029.9E+015.3E+01-5.2E+015.3E+01k(conic)4.5E+00-1.1E+00- 4.9E+016.2E-01-4.9E+01A(4th) / C4-5.4E-074.6E-080.0E+00-6.3E-060.0E+00B(6th) / C52.6E-0 80.0E+000.0E+003.1E-080.0E+00C(8th) / C6-7.1E-110.0E+000.0E+00-1.1E-100.0E+00D(10th) / C70.0E+000.0E+000.0E+002.2E-130.0E+00E(12th) / C80.0E+000.0E+000.0E+00-1.7E-160.0E+00

[0135] Surf11171819Radius of curvature9.9E+019.9E+015.3E+01-5.2E+01k(conic)-1.1E+00- 1.1E+00-4.9E+016.2E-01A(4th) / C44.6E-084.6E-080.0E+00-6.3E-06B(6th) / C50. 0E+000.0E+000.0E+003.1E-08C(8th) / C60.0E+000.0E+000.0E+00-1.1E-10D(10th) ) / C70.0E+000.0E+000.0E+002.2E-13E(12th) / C80.0E+000.0E+000.0E+00-1.7E-16

[0136] FIG. 8 illustrates a path along which light output by a display (D) is focused or guided to a user's eye (Y) in a wearable electronic device (600) according to one embodiment of the present disclosure.

[0137] The description of the first polarizing unit (P1), the second polarizing unit (P2), and the beam splitter (BS) (405) of FIG. 8 may be applied to the description of the first polarizing unit (P1), the second polarizing unit (P2), and the beam splitter (BS) (405) described above with reference to FIG. 5, and in the following, common contents may be omitted and the description may focus on differences.

[0138] According to one embodiment, the arrangement of the polarizers (P1, P2) and / or the beam splitter (405) of the polarizing assembly (P) described above can provide a good quality image while miniaturizing the optical system implemented with a limited number (e.g., at least 3) of lenses (L1, L2, L3). According to one embodiment, the polarization axis of the first polarizer (402) of the first polarizer (P1) and the polarization axis of the second polarizer (408) of the second polarizer (P2) can form 90 degrees. The fast axis of the first 1 / 4 wave plate (404) of the first polarizer (P1) and the fast axis of the second 1 / 4 wave plate (407) of the second polarizer (P2) can form 90 degrees. In the following description, reference to the anti-reflection members (401, 406) may be omitted.

[0139] Referring to FIG. 8, according to one embodiment, the wearable electronic device (600) may operate as follows. Light output from the display (D) may reach the user's eye (Y) after passing through at least three lenses (L1, L2, L3) of the lens assembly (LA), the second polarizing unit (P2), the beam splitter (BS), and the first polarizing unit (P1). At this time, the second polarizer (408) of the second polarizing unit (P2) may transmit the first linear polarization, for example, vertical polarization (or p polarization), and may not transmit the second linear polarization, for example, horizontal polarization (or s polarization). According to one embodiment, the light output from the display (D) may pass through the third lens (L3) and reach the second polarizer (408). Among the light reaching the second polarizer (408), only vertically polarized light (or p-polarized light) can be transmitted. The light passing through the second polarizer (408) is converted into circularly polarized light (right-hand circularly polarized light or left-hand circularly polarized light) by the second 1 / 4 wave plate (407), and this circularly polarized light can pass through the beam splitter (405) and the second lens (L2) in sequence before reaching the first 1 / 4 wave plate (404). The circularly polarized light reaching the first 1 / 4 wave plate (404) is converted back into linearly polarized light (e.g., vertically polarized light (or p-polarized light)) while passing through the first 1 / 4 wave plate (404) and can reach the reflective polarizer (403). Until reaching the reflective polarizer (403), the light can move in the second direction (display (D) -> user's eye (Y)). Light reaching the reflective polarizer (403) is reflected by the reflective polarizer (403) and directed in the first direction (user's eye (Y) -> display (D)), and can be converted into circular polarization (right-hand polarization or left-hand circular polarization) while passing through the first 1 / 4 wave plate (404). This circular polarization (right-hand polarization or left-hand circular polarization) is reflected by the beam splitter (405) and directed in the second direction again, and at this time, the phase can be converted (for example, when it is left-hand circular polarization -> right-hand circular polarization, when it is right-hand circular polarization -> left-hand circular polarization).The phase-converted circular polarization can pass through the first 1 / 4 wave plate (404) and the reflective polarizer (403) along the second direction to reach the user's eye (Y). At this time, the light passing through the first 1 / 4 wave plate (404) is converted into horizontal polarization (or s polarization) and can reach the first polarizer (402) of the first polarizing unit (P1). The first polarizer (402) can transmit horizontal polarization (or s polarization) and not transmit vertical polarization (or p polarization). The light passing through the first polarizer (402) can reach the user's eye (Y) as horizontal polarization (or s polarization) converted from the first 1 / 4 wave plate (404) into vertical polarization (or p polarization) once more blocked. However, it should be noted that the embodiment of FIG. 8 is merely an example of a change in the state of light passing through a wearable electronic device (600) according to one embodiment, and that the conversion of polarization components by the reflective polarizer (403), the quarter wave plate (404, 407), the beam splitter (405), and / or the second polarizer (408) may be different from the embodiment mentioned.

[0140] FIG. 9A is a diagram illustrating a wearable electronic device (600) (e.g., the electronic device (101) of FIG. 1 or the wearable electronic device (600) of FIG. 8) according to one embodiment of the present disclosure. FIG. 9B is a diagram illustrating an enlarged portion C of FIG. 9A according to one embodiment of the present disclosure.

[0141] The lens assembly (LA) and display (D) of FIG. 9a may be referred to as the lens assembly (LA) and display (D) of FIG. 8. In the description of the lens assembly (LA) and display (D) of FIG. 9a, any content that overlaps with the description given above with reference to FIGS. 6a and 6b may be omitted below.

[0142] According to one embodiment, the lens assembly (LA) of the wearable electronic device (600) may include a first polarizing portion (P1), a beam splitter (BS), and a second polarizing portion (P2) sequentially arranged from the user's eye (Y) side to the display (D) side. According to one embodiment, the first polarizing portion (P1) of the polarizing assembly (P) (e.g., the first polarizing portion (P1) of FIG. 8) may be disposed on the display-side surface (D1) of the first lens (L1). The second polarizing portion (P2) of the polarizing assembly (P) (e.g., the second polarizing portion (P2) of FIG. 8) may be disposed on the user's eye-side surface (E3) of the third lens (L3). In one embodiment, when the first polarizing element (P1) is substantially attached to a surface of any one of the lenses (L1, L2, L3), the corresponding lens surface (e.g., the display-side surface (D1) of the first lens (L1) and / or the user's eye-side surface (E3) of the third lens (L3)) may be substantially planar.

[0143] According to one embodiment, a beam splitter (BS) (e.g., beam splitter (405) of FIG. 8) may be disposed between the first polarizing portion (P1) and the second polarizing portion (P2). According to one embodiment, referring to FIG. 9B, the beam splitter (BS) may be provided on the display-side surface (D2) of the second lens (L2). For example, the beam splitter (BS) may be formed on the display-side surface (D2) of the second lens (L2) by substantially depositing or coating an optical material.

[0144] In one embodiment, the display (D) and lens assembly (LA) (or display device) may have an angle of view of about 108.00 degrees, a focal length (EFL) of about 14.61 mm, and an F-number (or Fno) of about 3.18. In one embodiment, the effective pixel area length (DL) of the display (D) may be about 24.54 mm, and the DL / EFL value may be about 1.68, which may satisfy the above-described [Equation 1].

[0145] In one embodiment, the lens assembly (LA) can be manufactured with the specifications presented in [Table 7] and can have aspheric coefficients of [Table 8] and [Table 9]. In [Table 7], 'REF.' exemplifies reference numbers assigned to lenses (L1, L2, L3) and / or polarizers (P1, P2) of FIGS. 9A and 9B, and 'lens surface' describes an ordinal number assigned to a surface of a lens or polarizer that transmits (or reflects) visual information, and may be sequentially assigned an ordinal number along the reverse direction of the optical path from the display (D) to the user's eye (Y). The 'Display window' of [Table 7] (e.g., the cover window (W) of FIG. 6) may be a substantially transparent plate as a plate for protecting the display.

[0146] REF.Lens surface (surface)Radius of curvature (radius)Thickness (Thick)MaterialRefractive index (nd)Abbe number (vd)Refraction modeEYEinfinityinfinityRefractionSTOPinfinity10.000RefractionL1294.7082.942OPTIMAS75001.49757.38Refraction3infinity0.300FILM1.49557.47RefractionP15infinity0.200RefractionL2648.2687.583OPTIMAS75001.49757.38Refraction7-68.467-7.583OPTIMAS7500-1.49757.38Reflectance848.268-0.200 Refractive Polarizing Film 9 infinity-0.210 FILM-1.49557.47 Refractive Polarizing Film 10 infinity 0.210 FILM 1.49557.47 Reflective Polarizing Film 11 infinity 0.200 Refractive L 2 1 2 4 8.268 7.583 OPTIMAS 75 0 0 1.49757.38 Refractive 13-68.467 0.150 Refractive P 2 1 4 infinity 0.176 FILM 1.49557.47 Refractive L 3 1 5 infinity 2.000 EP 8 0 0 0 1.67220.37 Refractive 1694.37 11.590 Refractive Display Window 17 infinity 0.500 BSC7_HOYA 1.52064.2 Refractive 18 infinity 0.010 Refractive Display Infinity 0.000

[0147] Surf2678 Radius of curvature9.47E+014.83E+01-6.85E+014.83E+01k(conic)-9.90E+01-3.79E+ 00-1.68E-02-3.79E+00A(4th) / C41.42E-06-1.58E-05-2.83E-06-1.58E-05B(6th) / C50.00 E+000.00E+00-4.40E-090.00E+00C(8th) / C60.00E+000.00E+008.90E-130.00E+00D(10th) / C70.00E+000.00E+00-3.41E-150.00E+00E(12th) / C80.00E+000.00E+006.50E-180.00E+00

[0148] Surf121316 Radius of curvature4.83E+01-6.85E+019.44E+01k(conic)-3.79E+00-1.68E-02-9.56E+01A(4th) / C4-1.58E-05-2.83E-060.00E+00B(6th) / C5 0.00E+00-4.40E-090.00E+00C(8th) / C60.00E+008.90E-130.00E+00D(10t h) / C70.00E+00-3.41E-150.00E+00E(12th) / C80.00E+006.50E-180.00E+00

[0149] FIG. 10A is a diagram illustrating a wearable electronic device (700) (e.g., the electronic device (101) of FIG. 1 or the wearable electronic device (600) of FIG. 8) according to one embodiment of the present disclosure. FIG. 10B is a diagram illustrating an enlarged portion G of FIG. 10A according to one embodiment of the present disclosure.

[0150] The lens assembly (LA) and display (D) of FIG. 10a may be referred to as the lens assembly (LA) and display (D) of FIG. 8. In the description of the lens assembly (LA) and display (D) of FIG. 10a, any content that overlaps with the description given above with reference to FIGS. 6a and 6b may be omitted below.

[0151] According to one embodiment, the lens assembly (LA) of the wearable electronic device (700) may include a first polarizing portion (P1), a beam splitter (BS), and a second polarizing portion (P2) sequentially arranged from the user's eye (Y) side to the display (D) side. According to one embodiment, the first polarizing portion (P1) of the polarizing assembly (P) (e.g., the first polarizing portion (P1) of FIG. 8) may be disposed on the display-side surface (D1) of the first lens (L1). According to one embodiment, the second polarizing portion (P2) of the polarizing assembly (P) (e.g., the second polarizing portion (P2) of FIG. 8) may be disposed on the user's display-side surface (D3) of the third lens (L3). In one embodiment, when the first polarizing element (P1) is substantially attached to a surface of any one of the lenses (L1, L2, L3), the corresponding lens surface (e.g., the display-side surface (D1) of the first lens (L1) and / or the user's display-side surface (D3) of the third lens (L3)) may be substantially planar.

[0152] According to one embodiment, a beam splitter (BS) (e.g., beam splitter (405) of FIG. 8) may be disposed between the first polarizing portion (P1) and the second polarizing portion (P2). According to one embodiment, referring to FIG. 10b, the beam splitter (BS) may be provided on the display-side surface (D2) of the second lens (L2). For example, the beam splitter (BS) may be formed on the display-side surface (D2) of the second lens (L2) by substantially depositing or coating an optical material.

[0153] In one embodiment, the display (D) and lens assembly (LA) (or display device) may have an angle of view of about 105.00 degrees, a focal length (EFL) of about 19.67 mm, and an F-number (or Fno) of about 3.18. In one embodiment, the effective pixel area length (DL) of the display (D) may be about 32.91 mm, and the DL / EFL value may be about 1.67, which may satisfy the above-described [Equation 1].

[0154] In one embodiment, the lens assembly (LA) may be manufactured with the specifications presented in [Table 10] and may have an aspherical coefficient of [Table 11]. In [Table 10], 'REF.' exemplifies a reference number assigned to the lenses (L1, L2, L3) and / or polarizers (P1, P2) of FIGS. 10a and 10b, and 'lens surface' describes an ordinal number assigned to a surface of a lens or polarizer that transmits (or reflects) visual information, and may be sequentially assigned an ordinal number along the reverse direction of the optical path from the display (D) to the user's eye (Y). The 'Display window' of [Table 10] (e.g., the cover window (W) of FIG. 6) may be a substantially transparent plate as a plate for protecting the display.

[0155] REF.Lens surface (surface)Radius of curvature (radius)Thickness (Thick)MaterialRefractive index (nd)Abbe number (vd)Refraction modeEYEinfinityinfinityRefractionSTOPinfinity10.104RefractionL12107.3894.000APEL55141.54756.09Refraction3infinity0.222FILM1.49557.47RefractionP14infinity3.436RefractionL25159.6305.730APEL55141.54756.09Refraction6-76.932-5.730APEL5514-1.54756.09Reflection7159.630-3.436 Refractive Polarizing Film 8 infinity-0.222 APEL5514-1.54756.09 Refractive Polarizing Film 9 infinity 0.222 APEL5514 1.54756.09 Reflective Polarizing Film 10 infinity 3.436 Refractive L2 1 1 59.63 05.730 APEL5514 1.54756.09 Refractive 12-76.93 20.663 Refractive L3 13-128.80 11.831 EP5000 1.644 23.98 Reflective 14 infinity 0.300 FILM 1.49 557.47 Refractive P2 15 infinity 1.829 Refractive Display Window 16 infinity 0.510 BSC7_HOYA 1.52064.2 Refractive 17 infinity 0.104 Refractive Imginfinity refraction

[0156] Surf2612 Radius of curvature1.07E+02-7.69E+01-7.69E+01k(conic)-8.46E+010.00E+000.00E+00A(4th) / C41.31E-057.06E-077.06E-07B(6th) / C5-7.6 0E-092.01E-092.01E-09C(8th) / C64.00E-12-2.58E-12-2.58E-12D(10th) / C70.00E+005.44E-155.44E-15E(12th) / C80.00E+00-9.22E-19-9.22E-19

[0157] A lens assembly (e.g., the lens assembly (LA) of FIGS. 5, 6A, 7A, 8, 9A, and 10A) and / or a wearable electronic device including the same (e.g., the electronic device (101) of FIG. 1, and the wearable electronic devices (400, 500, 600, and 700) of FIGS. 5, 6A, 7A, 8, 9A, and 10A) according to an embodiment(s) of the present disclosure can be miniaturized while easily controlling aberrations and implementing good image quality by satisfying at least some of the above-described specifications or conditions. For example, even when used while worn on a user's head or face, the lens assembly and / or the wearable electronic device including the same can reduce user fatigue.

[0158] However, the challenges addressed by this disclosure may be determined in various ways, as long as they do not deviate from the spirit and scope of this disclosure. The benefits achieved by this disclosure are not limited to those mentioned above, and various other benefits may be provided, directly or indirectly, through this document.

[0159] According to one embodiment of the present disclosure, a display device may be provided. The display device may include a display (D) configured to output light and a lens assembly (LA) configured to guide light output from the display toward a user's eye (Y). The lens assembly may include at least three lenses (L1, L2, L3) sequentially arranged from the user's eye side toward the display side along a light axis (O) and a polarization assembly. The polarization assembly may include a first polarization portion (P1), a beam splitter (BS; 405), and a second polarization portion (P2) sequentially arranged from the user's eye side toward the display side. The at least three lenses of the lens assembly may include a synthetic resin. At least one lens of the at least three lenses may have an Abbe number of 40 or less and have negative refractive power. The beam splitter of the polarizing assembly may include a reflective surface formed as an aspherical surface without an inflection point. The display device may satisfy the following [Equation 1].

[0160] [Formula 1]

[0161] 1 <DL / EFL< 3

[0162] (Here, DL is the effective pixel area length of the display, and EFL is the composite focal length of the entire optical system (or the composite focal length of the entire display device).

[0163] According to one embodiment, the field of view (FOV) of the display device may be greater than 100 degrees.

[0164] According to one embodiment, at least one of the user's eye side or the display side of the first polarizing unit may be configured as a plane, and at least one of the user's eye side or the display side of the second polarizing unit may be configured as a plane.

[0165] According to one embodiment, the polarizing assembly may be positioned between the first lens (L1) that is furthest from the display among the at least three lenses and the display.

[0166] According to one embodiment, the polarizing assembly may be positioned between a first lens (L1) that is farthest from the display among the at least three lenses and a third lens (L3) that is closest to the display among the at least three lenses.

[0167] According to one embodiment, the polarizing assembly may be configured to reflect light output from the display at least twice between a first lens (L1) that is farthest from the display among the at least three lenses and a lens (L3) that is closest to the display among the at least three lenses.

[0168] According to one embodiment, the first polarizing unit may include a first polarizer (402), a first reflective polarizer (403), and a first quarter wave plate (404). The second polarizing unit may include a second polarizer (408) and a second quarter wave plate (407).

[0169] According to one embodiment, the first polarizer, the first reflective polarizer and the first 1 / 4 wave plate of the first polarizing unit may be coupled to each other or spaced apart from each other with at least one of another polarizing layer, an air layer or a dummy layer therebetween.

[0170] In one embodiment, the second polarizer and the second 1 / 4 wave plate of the second polarizing unit may be coupled to each other or spaced apart from each other with at least one of another polarizing layer, an air layer, or a dummy layer therebetween.

[0171] In one embodiment, the polarization axis of the first polarizer and the polarization axis of the second polarizer may form a 90 degree angle. The fast axis of the first 1 / 4 wave plate and the fast axis of the second 1 / 4 wave plate may form a 90 degree angle.

[0172] According to one embodiment, a display device, wherein at least one of the first polarizing member or the second polarizing member includes an anti-reflection layer (401; 406).

[0173] In one embodiment, the first polarizing member may be positioned between a first lens (L1) that is furthest from the display among the at least three lenses and a second lens (L2) that is second closest to the display. The second polarizing member may be positioned between a lens (L3) that is closest to the display among the at least three lenses and the display.

[0174] According to one embodiment, the beam splitter may be arranged on the display-side surface of the lens (L3) closest to the display among the at least three lenses.

[0175] In one embodiment, the first polarizing member may be disposed between a first lens (L1) that is furthest from the display among the at least three lenses and a second lens (L2) that is second closest to the display. The second polarizing member may be disposed between a lens (L3) that is closest to the display among the at least three lenses and the second lens (L2).

[0176] According to one embodiment, the beam splitter may be disposed on the display-side surface of the second lens (L2).

[0177] According to one embodiment of the present disclosure, a wearable electronic device may be provided. The wearable electronic device may include a display (D) configured to output light, at least three lenses (L1, L2, L3) sequentially arranged from a user's eye side toward the display side along a light axis (O), and a polarizing assembly (P) configured to reflect light output from the display at least twice between a first lens (L1) of the at least three lenses that is farthest from the display and a lens (L3) of the at least three lenses that is closest to the display. The polarizing assembly may include a first polarization portion (P1), a beam splitter (BS; 405), and a second polarization portion (P2) that are sequentially arranged from a user's eye side toward the display side. The at least three lenses of the lens assembly may include a synthetic resin. At least one of the three lenses may have an Abbe number of 40 or less and negative refractive power. The beam splitter of the polarizing assembly may include a reflective surface formed as an aspherical surface without an inflection point. The wearable electronic device may satisfy the following [Equation 1].

[0178] [Formula 1]

[0179] 1 <DL / EFL< 3

[0180] (Here, DL is the effective pixel area length of the display, and EFL is the synthetic focal length of the entire optical system)

[0181] According to one embodiment, the field of view (FOV) of the display device may be greater than 100 degrees.

[0182] According to one embodiment, the polarizing assembly may be positioned between the first lens (L1) that is furthest from the display among the at least three lenses and the display.

[0183] At least one of the user's eye side or the display side of the first polarizing unit may be configured as a flat surface, and at least one of the user's eye side or the display side of the second polarizing unit may be configured as a flat surface.

[0184] According to one embodiment, the first polarizing unit may include a first polarizer (402), a first reflective polarizer (403), and a first quarter wave plate (404). The second polarizing unit may include a second polarizer (408) and a second quarter wave plate (407).

[0185] In one embodiment, the first polarizer, the first reflective polarizer, and the first 1 / 4 wave plate of the first polarizing unit may be coupled to each other or spaced apart from each other with at least one of another polarizing layer, an air layer, or a dummy layer therebetween. The second polarizer and the second 1 / 4 wave plate of the second polarizing unit may be coupled to each other or spaced apart from each other with at least one of another polarizing layer, an air layer, or a dummy layer therebetween.

[0186] While this disclosure has been described by way of example, it should be understood that the specific embodiments are intended to be illustrative and not limiting. It will be apparent to those skilled in the art that various changes in form and detail may be made without departing from the overall scope of this disclosure, including the appended claims and their equivalents.

[0187] An electronic device according to an embodiment disclosed in this document may take various forms. The electronic device may include, for example, a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. The electronic device according to an embodiment of this document is not limited to the aforementioned devices.

[0188] It should be understood that the embodiments of this document and the terminology used herein are not intended to limit the technical features described in this document to a specific embodiment, but include various modifications, equivalents, or substitutes of the embodiment. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the item, unless the context clearly indicates otherwise. In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" can include any one of the items listed together in the corresponding phrase among those phrases, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used merely to distinguish one component from another, and do not limit the components in any other respect (e.g., importance or order). When a component (e.g., a first component) is referred to as "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0189] The term "module" used in one embodiment of this document may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integral component, or a minimum unit or part of such a component that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0190] An embodiment of the present document may be implemented as software (e.g., a program (140)) including one or more instructions stored in a storage medium (e.g., an internal memory (136) or an external memory (138)) readable by a machine (e.g., an electronic device (101)). For example, a processor (e.g., a processor (120)) of the machine (e.g., an electronic device (101)) may call at least one instruction among the one or more instructions stored from the storage medium and execute it. This enables the machine to operate to perform at least one function according to the at least one called instruction. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' simply means that the storage medium is a tangible device and does not contain signals (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently or temporarily on the storage medium.

[0191] According to one embodiment, the method according to one embodiment disclosed in the present document may be provided as a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) via an application store (e.g., Play Store™) or directly between two user devices (e.g., smart phones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0192] According to one embodiment, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to one embodiment, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to one embodiment, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

Claims

1. In the display device, a display (D) configured to output light; and A lens assembly (LA) configured to guide light output from the display toward the user's eye (Y), comprising at least three lenses (L1, L2, L3) sequentially arranged from the user's eye side toward the display side along the light axis (O); and a polarization assembly (P) including a first polarization portion (P1), a beam splitter (BS; 405), and a second polarization portion (P2) sequentially arranged from the user's eye side toward the display side, The at least three lenses of the lens assembly include a synthetic resin, and at least one lens among the at least three lenses has an Abbe number of 40 or less and has negative refractive power, The beam splitter of the polarizing assembly includes a reflective surface formed as an aspherical surface without an inflection point, A display device satisfying the following [Formula 1]. [Formula 1] 1 <DL / EFL< 3 (Here, DL is the effective pixel area length of the display, and EFL is the synthetic focal length of the entire optical system.) 2. In paragraph 1, A display device having a field of view (FOV) of 100 degrees or more.

3. In paragraph 1 or 2, A display device, wherein at least one of the user's eye side or the display side of the first polarizing unit is configured as a flat surface, and at least one of the user's eye side or the display side of the second polarizing unit is configured as a flat surface.

4. In any one of paragraphs 1 to 3, A display device, wherein the polarizing assembly is positioned between the first lens (L1) farthest from the display among the at least three lenses and the display.

5. In any one of paragraphs 1 to 4, A display device, wherein the polarizing assembly is disposed between a first lens (L1) among the at least three lenses, which is farthest from the display, and a third lens (L3) among the at least three lenses, which is closest to the display.

6. In any one of paragraphs 1 to 5, A display device, wherein the polarizing assembly is configured to reflect light output from the display at least twice between a first lens (L1) farthest from the display among the at least three lenses and a lens (L3) closest to the display among the at least three lenses.

7. In any one of paragraphs 1 to 6, The first polarizing unit includes a first polarizer (402), a first reflective polarizer (403), and a first quarter wave plate (404). A display device, wherein the second polarizing unit includes a second polarizer (408) and a second 1 / 4 wavelength plate (407).

8. In paragraph 7, A display device, wherein the first polarizer, the first reflective polarizer and the first 1 / 4 wave plate of the first polarizing unit are coupled to each other or spaced apart from each other with at least one of another polarizing layer, an air layer or a dummy layer therebetween.

9. In clause 7 or 8, A display device, wherein the second polarizer and the second 1 / 4 wave plate of the second polarizing unit are coupled to each other or spaced apart from each other with at least one of another polarizing layer, an air layer, or a dummy layer therebetween.

10. In any one of paragraphs 7 to 9, The polarization axis of the first polarizer and the polarization axis of the second polarizer form a 90 degree angle, A display device, wherein the fast axis of the first 1 / 4 wave plate and the fast axis of the second 1 / 4 wave plate form a 90 degree angle.

11. In any one of paragraphs 1 to 10, A display device, wherein at least one of the first polarizing member or the second polarizing member includes an anti-reflection layer (401; 406).

12. In any one of clauses 1 to 11, The first polarizing member is positioned between the first lens (L1) farthest from the display among the at least three lenses and the second lens (L2) second closest to the display, A display device, wherein the second polarizing member is positioned between the lens (L3) closest to the display among the at least three lenses and the display.

13. In paragraph 12, A display device, wherein the beam splitter is arranged on the surface of the display side of the lens (L3) closest to the display among the at least three lenses.

14. In any one of paragraphs 1 to 11, The first polarizing member is positioned between the first lens (L1) farthest from the display among the at least three lenses and the second lens (L2) second closest to the display, A display device, wherein the second polarizing member is positioned between the lens (L3) closest to the display among the at least three lenses and the second lens (L2).

15. In paragraph 14, A display device, wherein the beam splitter is arranged on the display side surface of the second lens (L2).

Images